CN110959399A

CN110959399A - Tree grafting maintenance device based on solar photovoltaic power generation system

Info

Publication number: CN110959399A
Application number: CN201910976147.7A
Authority: CN
Inventors: 刘若男
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-04-07

Abstract

The invention discloses a tree grafting maintenance device based on a solar photovoltaic power generation system, which comprises a trunk, wherein a first fixing device is arranged above the trunk, an adjusting rod is connected inside an installation shaft, a second locking block is in threaded connection with the inside of the front side of a limiting block, the tail end of the limiting shaft is connected with a second fixing device, a power generation panel is arranged on the right side of a chemical box, a maintenance chemical bag is installed inside the chemical box, a maintenance liquid delivery pipe is arranged in the middle of the maintenance chemical bag, a liquid regulating structure is arranged in the middle of the maintenance liquid delivery pipe, an adhesive block is fixed on the right side of the trunk, and a connecting piece is connected inside the fixing block. This curing means of trees grafting based on solar photovoltaic power generation system, stable fixed of being convenient for, and can the effectual flow of control maintenance liquid, the interference of transfer line.

Description

Tree grafting maintenance device based on solar photovoltaic power generation system

Technical Field

The invention relates to the technical field related to tree grafting, in particular to a tree grafting maintenance device based on a solar photovoltaic power generation system.

Background

Grafting, one of the artificial nutrition propagation methods of plants, namely, grafting a branch or a bud of one plant onto a stem or a root of another plant, so that the two parts which are grafted together grow into a complete plant, wherein the grafting mode is divided into branch grafting and bud grafting, and in order to enable the scion to be tightly combined with a cambium of a stock during grafting, the maintenance of the grafting part becomes very important to ensure the survival of the scion, the existing grafting method is often tied up by using a binding band, but the operation can be performed by people with experience, so that the demand of people on a maintenance device for tree grafting is larger;

for example, the tree grafting device for the laccai insect with the authorization bulletin number of CN105850515B is simple in structure and convenient to use, ensures the normal production of the laccai insect on a main grafted plant in nature, avoids the infringement of natural enemies, also avoids the erosion of rainwater, is convenient to collect, has high recycling rate, is not convenient to stably fix, cannot effectively control the flow of a curing liquid, is not convenient to stably convey the curing liquid, and is not convenient to fix a liquid conveying pipe, so that the interference of external factors on the liquid conveying pipe is caused.

Disclosure of Invention

The invention aims to provide a tree grafting maintenance device based on a solar photovoltaic power generation system, which solves the problems that the traditional maintenance device in the background technology is inconvenient to stably fix, cannot effectively control the flow of maintenance liquid, is inconvenient to stably convey the maintenance liquid and is inconvenient to fix a liquid conveying pipe, so that the liquid conveying pipe is interfered by external factors.

In order to achieve the purpose, the invention provides the following technical scheme: a maintenance device for tree grafting based on a solar photovoltaic power generation system comprises a trunk, wherein a first fixing device is arranged above the trunk, an installation shaft is fixed on the right side of the first fixing device, a third fixing device is arranged below the middle of the trunk, an adjusting rod is connected inside the installation shaft, a limiting block is arranged on the outer side of the bottom of the adjusting rod, a second locking block is connected inside the front side of the limiting block in a threaded manner, a limiting shaft is hinged inside the right side of the limiting block, the tail end of the limiting shaft is connected with a second fixing device, a tree stem rod is fixed inside the second fixing device, a medicine box is arranged on the right side of the middle of the adjusting rod, a top cover is connected with the top end of the medicine box in a threaded manner, a pressing shaft is arranged inside the top cover, a pressing block is fixed at the bottom of the pressing shaft, and a clamping block is connected at the top of the, and the left and right sides of chucking piece all is provided with the elastic webbing to the end-to-end connection of elastic webbing has the locking band piece, the right side of chemical tank is provided with the solar photovoltaic power generation panel, and is fixed with the battery below the left side of solar photovoltaic power generation panel, and the end-to-end connection of battery has the light, the internally mounted of chemical tank has maintenance chemical bag, and the middle part of maintenance chemical bag is provided with defeated maintenance liquid pipe, the middle part of defeated maintenance liquid pipe is provided with the liquid regulation structure, and the end-to-end connection of defeated maintenance liquid pipe has the dropper head, the right side of trunk is fixed with sticky piece, and the right side bonding of sticky piece has the fixed block, the internally connected of fixed block has the connecting piece, and.

Preferably, first fixing device includes first tight hoop block, second tight hoop block, first locking block, decides tight pole, adjustment shaft and installation piece, and the right side of first tight hoop block is provided with the tight hoop block of second, and the end connection of the tight hoop block of second has first locking block, and the internal connection of the tight hoop block of second has decides tight pole, and the inboard of deciding tight pole is connected with the adjustment shaft, and the inner of adjustment shaft is fixed with the installation piece.

Preferably, the cross section of the first tightening hoop block and the cross section of the second tightening hoop block are both in a semicircular arc structure, and the first tightening hoop block is fixedly connected with the second tightening hoop block through a first locking block.

Preferably, the inside of the first tight hoop block and the second tight hoop block is connected with a tight rod through threads, and the mounting block forms a telescopic structure with the first tight hoop block and the second tight hoop block through the tight rod.

Preferably, the middle-upper portion of adjusting lever runs through in the inside of installation axle, and adjusting lever and installation axle constitute rotating-structure, and the stopper constitutes sliding structure with the adjusting lever, and the stopper passes through second latch segment and adjusting lever fixed connection to the stopper constitutes rotating-structure with the spacing axle.

Preferably, the compressing shaft forms a lifting structure in the top cover, the top end of the compressing shaft is connected with the clamping matching end of the clamping block in a clamping manner, the elastic band arranged on the outer side of the clamping block is connected with the locking band block in a clamping manner, and the central axis of the compressing shaft and the central axis of the compressing block coincide with each other.

Preferably, the maintenance medicament bag and the medicament box form a detachable structure, and the medicament box and the pressing block are connected in a clamping manner.

Preferably, transfer the liquid structure including transferring liquid piece, adjustment tank and connecting axle, and transfer the inside of liquid piece and be provided with the adjustment tank to the inside block in adjustment tank is connected with the connecting axle.

Preferably, the middle part of the right end of the liquid adjusting block is of a sunken structure, the longitudinal section of an adjusting groove formed in the liquid adjusting block is of a V-shaped structure, and the connecting shaft forms a sliding structure in the adjusting groove.

Preferably, the fastening block is connected with the fixed block in a clamping manner through a connecting piece, and the fastening block and the inner surface of the fixed block are both of arc-shaped structures.

Compared with the prior art, the invention has the beneficial effects that: the tree grafting maintenance device based on the solar photovoltaic power generation system is convenient to stably fix, can effectively control the flow of maintenance liquid, is convenient to stably convey the maintenance liquid, is convenient to fix a liquid conveying pipe, and prevents external factors from interfering the liquid conveying pipe;

1. the tree fixing device is provided with a first fixing device, a first fastening hoop block and a second fastening hoop block, wherein the first fastening hoop block with a semicircular arc-shaped cross section is fixedly connected with the second fastening hoop block through a first locking block, so that the first fastening hoop block and the second fastening hoop block are conveniently fixed on the outer side of a tree, and are conveniently and stably fixed under the action of the first fixing device, the second fixing device and the third fixing device;

2. the infusion tube is provided with a connecting shaft and two liquid adjusting blocks, wherein the middle part of the right end of each liquid adjusting block is of a concave structure, an adjusting groove is formed in the liquid adjusting block, the connecting shaft slides in the adjusting groove with the vertical section of a V-shaped structure, 2 connecting shafts are arranged, and the outer surface of the infusion tube is directly extruded by the rolling of the connecting shafts, so that the flow of maintenance liquid can be effectively controlled;

3. the elastic belt, the pressing shaft and the pressing block are arranged, the pressing shaft is lifted in the top cover under the action of the elastic force of the elastic belt, the central axis of the pressing shaft is overlapped with the central axis of the pressing block, and the maintenance liquid is conveniently and stably conveyed in the extrusion process of the pressing block;

4. be provided with straining piece, connecting piece and fixed block, the straining piece passes through the connecting piece to be connected with the fixed block, and the straining piece all is circular-arc structure with the internal surface of fixed block, is convenient for fix the transfer line to prevent the interference of external factors to the transfer line.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of the structure at B in FIG. 1 according to the present invention;

FIG. 5 is an enlarged view of the structure of FIG. 1 at C according to the present invention;

FIG. 6 is a schematic view of the connection structure of the fastening block and the fixing block of the present invention.

In the figure: 1. a tree trunk; 2. a first fixing device; 201. a first clamp block; 202. a second clamp block; 203. a first locking block; 204. a tightening rod; 205. an adjustment shaft; 206. mounting blocks; 3. installing a shaft; 4. an adjusting lever; 5. a limiting block; 6. a second locking block; 7. a limiting shaft; 8. a second fixing device; 9. a third fixing device; 10. a kit; 11. a top cover; 12. a pressing shaft; 13. a clamping block; 14. an elastic band; 15. a belt locking block; 16. a compression block; 17. a solar photovoltaic power generation panel; 18. a storage battery; 19. an illuminating lamp; 20. maintaining the medicament bag; 21. a liquid adjusting structure; 2101. a liquid adjusting block; 2102. an adjustment groove; 2103. a connecting shaft; 22. a maintenance liquid conveying pipe; 23. a fastening block; 24. a connecting member; 25. a fixed block; 26. gluing blocks; 27. a dropper head; 28. a tree stem.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a maintenance device for tree grafting based on a solar photovoltaic power generation system comprises a trunk 1, a first fixing device 2, an installation shaft 3, an adjusting rod 4, a limiting block 5, a second locking block 6, a limiting shaft 7, a second fixing device 8, a third fixing device 9, a chemical box 10, a top cover 11, a pressing shaft 12, a clamping block 13, an elastic band 14, a locking block 15, a pressing block 16, a solar photovoltaic power generation panel 17, a storage battery 18, a lighting lamp 19, a maintenance chemical bag 20, a liquid adjusting structure 21, a liquid conveying and maintaining pipe 22, a fastening block 23, a connecting piece 24, a fixing block 25, an adhesive block 26, a dropper head 27 and a stem rod 28, wherein the first fixing device 2 is arranged above the trunk 1, the installation shaft 3 is fixed on the right side of the first fixing device 2, the installation shaft of the third fixing device 9 is arranged below the middle part of the trunk 1, the adjusting rod 4 is connected inside the trunk 3, a limiting block 5 is arranged at the outer side of the bottom of the adjusting rod 4, a second locking block 6 is connected with the inner part of the front side of the limiting block 5 through screw threads, a limiting shaft 7 is hinged with the inner part of the right side of the limiting block 5, the tail end of the limiting shaft 7 is connected with a second fixing device 8, a tree stem rod 28 is fixed inside the second fixing device 8, a medicine box 10 is arranged at the right side of the middle part of the adjusting rod 4, a top cover 11 is connected with the top end of the medicine box 10 through screw threads, a pressing shaft 12 is arranged inside the top cover 11, a pressing block 16 is fixed at the bottom of the pressing shaft 12, a clamping block 13 is connected at the top of the pressing shaft 12, elastic belts 14 are arranged at the left side and the right side of the clamping block 13, a locking belt block 15 is connected at the tail end of the elastic belts 14, a solar photovoltaic power generation panel 17 is arranged at the right side of the medicine box 10, the internally mounted of chemical tank 10 has maintenance chemical bag 20, and the middle part of maintenance chemical bag 20 is provided with defeated maintenance liquid pipe 22, and the middle part of defeated maintenance liquid pipe 22 is provided with transfers liquid structure 21, and the end-to-end connection of defeated maintenance liquid pipe 22 has dropper head 27, and the right side of trunk 1 is fixed with gluing piece 26, and the right side bonding of gluing piece 26 has fixed block 25, and the internally connected of fixed block 25 has connecting piece 24, and the right-hand member of connecting piece 24 is fixed with straining piece 23.

As shown in fig. 1 and 2, the first fixing device 2 includes a first fastening hoop block 201, a second fastening hoop block 202, a first locking block 203, a fastening rod 204, an adjusting shaft 205 and a mounting block 206, the right side of the first fastening hoop block 201 is provided with the second fastening hoop block 202, the end of the second fastening hoop block 202 is connected with the first locking block 203, the inside of the second fastening hoop block 202 is connected with the fastening rod 204, the inner side of the fastening rod 204 is connected with the adjusting shaft 205, the inner end of the adjusting shaft 205 is fixed with the mounting block 206 to facilitate the fixing of the trunk 1 and the first fixing device 2, the cross sections of the first fastening hoop block 201 and the second fastening hoop block 202 are both in a semi-circular arc structure, and the first fastening hoop block 201 is fixedly connected with the second fastening hoop block 202 through the first locking block 203, the inner side of the first fastening hoop block 201 is fixedly connected with the second fastening hoop block 202 to facilitate the stable fixing of the first fastening hoop block 201 and the second fastening hoop block 202, the inner parts of the first fastening hoop block 201 and the second fastening hoop block 202 are both connected with the fastening rods 204, and the installation piece 206 constitutes extending structure through deciding tight pole 204 and tight hoop block 201 of first tight and decide with the second and decide hoop block 202, conveniently fix not unidimensional trunk 1, the well upper portion of adjusting lever 4 runs through in the inside of installation axle 3, and adjusting lever 4 constitutes revolution mechanic with installation axle 3, stopper 5 constitutes sliding construction with adjusting lever 4, and stopper 5 passes through second latch segment 6 and adjusting lever 4 fixed connection, and stopper 5 constitutes revolution mechanic with spacing axle 7, conveniently adjust and fix the angle of spacing axle 7, thereby conveniently fix stem 28

As shown in fig. 4, the pressing shaft 12 forms a lifting structure inside the top cover 11, the top end of the pressing shaft 12 is connected with the clamping and mating end of the clamping block 13 in a clamping manner, the elastic band 14 arranged outside the clamping block 13 is connected with the locking band block 15 in a clamping manner, the central axis of the pressing shaft 12 and the central axis of the pressing block 16 coincide with each other, so that the maintenance liquid can be stably conveyed, the maintenance chemical bag 20 and the chemical box 10 form a disassembly structure, and the chemical box 10 and the pressing block 16 are connected in a clamping manner, so that the maintenance chemical bag 20 can be conveniently replaced;

as shown in fig. 3, the liquid mixing structure 21 comprises a liquid mixing block 2101, a regulating groove 2102 and a connecting shaft 2103, the regulating groove 2102 is arranged inside the liquid mixing block 2101, the connecting shaft 2103 is connected inside the regulating groove 2102 in a clamping mode, the flow of the curing liquid is conveniently controlled, the middle of the right end of the liquid mixing block 2101 is of a concave structure, the longitudinal section of the regulating groove 2102 arranged inside the liquid mixing block 2101 is of a V-shaped structure, and the connecting shaft 2103 forms a sliding structure inside the regulating groove 2102, so that the flow of the curing liquid can be effectively controlled;

as shown in fig. 5 and 6, the fastening block 23 is connected with the fixing block 25 through the connecting piece 24 in a clamping manner, and the inner surfaces of the fastening block 23 and the fixing block 25 are both arc-shaped structures, so that the infusion tube can be conveniently fixed, and the interference of external factors on the infusion tube is prevented.

The working principle is as follows: when the maintenance device for grafting trees based on the solar photovoltaic power generation system is used, firstly, the epidermis at the lower right of the trunk 1 in fig. 1 is cut open, the first fixing device 2 and the third fixing device 9 in fig. 1 are respectively fixed at the middle part of the trunk 1, then the middle part of the stem 28 is placed inside the second fixing device 8, the stem is rotated by the rotation of the limiting block 5 and the limiting shaft 7, the stem is slid to a proper height by the limiting block 5, the position of the limiting block 5 is fixed by the second locking block 6, then the left end part of the stem 28 is installed inside the trunk 1, the first fixing device 2, the second fixing device 8 and the third fixing device 9 are all composed of a first clamping hoop block 201, a second clamping hoop block 202, a first locking block 203, a locking rod 204, an adjusting shaft 205 and an installation block 206, the first clamping hoop block 201 and the second clamping hoop block 202 are locked by the first locking block 203 and connected by the second locking block 202, the inner surfaces of which are all in an arc-shaped structure Then, the tightening rod 204 is rotated by hand, and the tightening rod 204 in threaded connection with the tightening rod is rotated, so that the mounting block 206 is tightly pressed against the outer surface of the trunk 1, and the trunk 1 and the first fixing device 2 are conveniently and stably fixed;

then, the maintenance chemical bag 20 shown in fig. 1 is installed inside the chemical box 10, the top cover 11 is stably screwed on the top of the chemical box 10, then the end of the elastic band 14 shown in fig. 4 is fastened inside the locking band block 15, the clamping block 13 connected to the middle of the elastic band 14 is connected with the pressing shaft 12 in a clamping manner, the pressing block 16 can be effectively pushed under the action of the elastic band 14, and the maintenance chemical bag 20 is conveniently pressed under the action of the pressing block 16;

then, the fastening block 23 shown in fig. 5 and 6 is clamped and installed inside the fixing block 25 through the connecting piece 24, and the adhesive block 26 is adhered to the trunk 1, so that the infusion and maintenance liquid pipe 22 can be effectively and fixedly installed, and the infusion and maintenance liquid pipe 22 can be effectively prevented from being affected by external factors;

then rotate connecting axle 2103 with the hand in the inside adjusting groove 2102 as in fig. 3 again, the right-hand member is the setting of liquid adjusting block 2101 of "V" font structure, can effectually make connecting axle 2103 extrude defeated maintenance liquid pipe 22, thereby conveniently adjust the flow of inside maintenance liquid, under the effect of solar photovoltaic power generation panel 17, can effectually pass through the inverter with light energy and turn into the electric energy, and store in the inside of battery 18, and under the effect of light 19, can effective reasonable utilization energy, thereby make things convenient for the maintenance of trunk 1 and the maintenance of stem pole 28 junction, this is this maintenance device's operating principle based on the trees grafting of solar photovoltaic power generation system.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, and the details are not described, and the content not described in detail in the specification belongs to the prior art known by persons skilled in the art.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a curing means of trees grafting based on solar photovoltaic power generation system, includes trunk (1), its characterized in that: the medical tree trunk is characterized in that a first fixing device (2) is arranged above the trunk (1), an installation shaft (3) is fixed on the right side of the first fixing device (2), a third fixing device (9) is arranged below the middle of the trunk (1), an adjusting rod (4) is connected inside the installation shaft (3), a limiting block (5) is installed outside the bottom of the adjusting rod (4), a second locking block (6) is connected inside the front side of the limiting block (5) in a threaded manner, a limiting shaft (7) is hinged inside the right side of the limiting block (5), a second fixing device (8) is connected to the tail end of the limiting shaft (7), a tree trunk rod (28) is fixed inside the second fixing device (8), a medicine box (10) is arranged on the right side of the middle of the adjusting rod (4), a top end of the medicine box (10) is connected with a top cover (11) in a threaded manner, a pressing shaft (12) is arranged inside the top cover (11, a pressing block (16) is fixed at the bottom of the pressing shaft (12), the top of the pressing shaft (12) is connected with a clamping block (13), elastic belts (14) are arranged on the left side and the right side of the clamping block (13), the tail ends of the elastic belts (14) are connected with a belt locking block (15), a solar photovoltaic power generation panel (17) is arranged on the right side of the chemical box (10), a storage battery (18) is fixed on the lower left side of the solar photovoltaic power generation panel (17), a lighting lamp (19) is connected with the tail end of the storage battery (18), a maintenance chemical bag (20) is installed inside the chemical box (10), a maintenance chemical bag (20) is arranged in the middle of the maintenance chemical bag (20), a liquid delivery pipe (22) is arranged in the middle of the maintenance chemical delivery pipe (22), a liquid regulating structure (21) is arranged in the middle of the liquid delivery pipe (22), a dropper head (27) is connected with the tail end of the maintenance chemical, and the right side of sticky piece (26) bonds and has fixed block (25), the internal connection of fixed block (25) has connecting piece (24), and the right-hand member of connecting piece (24) is fixed with fastening piece (23).

2. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: first fixing device (2) are including first tight hoop piece (201), second tight hoop piece (202), first locking piece (203), decide tight pole (204), adjusting spindle (205) and installation piece (206), and the right side of first tight hoop piece (201) is provided with second tight hoop piece (202), the end connection of second tight hoop piece (202) has first locking piece (203), and the internal connection of second tight hoop piece (202) has decides tight pole (204), the inboard of deciding tight pole (204) is connected with adjusting spindle (205), and the inner of adjusting spindle (205) is fixed with installation piece (206).

3. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 2, characterized in that: the cross section of the first tightening hoop block (201) and the cross section of the second tightening hoop block (202) are both in a semicircular arc structure, and the first tightening hoop block (201) is fixedly connected with the second tightening hoop block (202) through a first locking block (203).

4. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 2, characterized in that: the inside of the first tight hoop block (201) and the second tight hoop block (202) is connected with a tight rod (204) in a threaded manner, and the mounting block (206) forms a telescopic structure with the first tight hoop block (201) and the second tight hoop block (202) through the tight rod (204).

5. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: the middle-upper portion of adjusting lever (4) runs through in the inside of installation axle (3), and adjusting lever (4) and installation axle (3) constitute rotating-structure, and stopper (5) and adjusting lever (4) constitute sliding construction, and stopper (5) pass through second latch segment (6) and adjusting lever (4) fixed connection to stopper (5) and spacing axle (7) constitute rotating-structure.

6. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: the pressing shaft (12) forms a lifting structure in the top cover (11), the top end of the pressing shaft (12) is connected with the clamping matching end of the clamping block (13) in a clamping mode, the elastic band (14) arranged on the outer side of the clamping block (13) is connected with the locking band block (15) in a clamping mode, and the central axis of the pressing shaft (12) and the central axis of the pressing block (16) are overlapped.

7. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: the maintenance medicament bag (20) and the medicament box (10) form a detachable structure, and the medicament box (10) and the pressing block (16) are connected in a clamping manner.

8. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: the liquid adjusting structure (21) comprises a liquid adjusting block (2101), an adjusting groove (2102) and a connecting shaft (2103), the adjusting groove (2102) is formed in the liquid adjusting block (2101), and the connecting shaft (2103) is connected to the adjusting groove (2102) in a clamping mode.

9. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 8, characterized in that: the middle part of the right end of the liquid adjusting block (2101) is of a sunken structure, the longitudinal section of an adjusting groove (2102) arranged in the liquid adjusting block (2101) is of a V-shaped structure, and the connecting shaft (2103) forms a sliding structure in the adjusting groove (2102).

10. The tree grafting maintenance device based on the solar photovoltaic power generation system according to claim 1, characterized in that: the fastening block (23) is connected with the fixing block (25) in a clamping mode through the connecting piece (24), and the inner surfaces of the fastening block (23) and the fixing block (25) are of arc-shaped structures.